OpenCL bindings for Go

Documentation at http://godoc.org/github.com/jgillich/go-opencl/cl.

See the test for usage examples.

By default, the OpenCL 1.2 API is exported. To get OpenCL 1.0, set the build tag cl10.

Differences from jgillich/go-opencl:

Fixed cl.Flush() calling clFinish(), and added additional APIs for asynchronous use